CN211947879U - Assembled corrugated web steel box-UHPC (ultra high performance concrete) combined beam bridge - Google Patents
Assembled corrugated web steel box-UHPC (ultra high performance concrete) combined beam bridge Download PDFInfo
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- CN211947879U CN211947879U CN202020238506.7U CN202020238506U CN211947879U CN 211947879 U CN211947879 U CN 211947879U CN 202020238506 U CN202020238506 U CN 202020238506U CN 211947879 U CN211947879 U CN 211947879U
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Abstract
The utility model relates to an assembled corrugated web steel box-UHPC composite beam bridge, which consists of a corrugated web steel box and an UHPC bridge deck plate, wherein the corrugated web steel box is an open box structure consisting of a flat steel bottom plate, a corrugated steel web and a flat steel top plate, and adjacent corrugated web steel boxes are connected through a cross beam between the boxes; the UHPC bridge deck comprises an in-box prefabricated UHPC bridge deck, an inter-box prefabricated UHPC bridge deck and a cantilever cast-in-situ UHPC bridge deck, wherein adjacent prefabricated UHPC bridge decks are connected through a cast-in-situ wet joint UHPC bridge deck; and a plurality of UHPC bridge deck plates are correspondingly arranged on a plurality of corrugated web steel boxes to form the assembled corrugated web steel box-UHPC combined beam bridge. The fabricated corrugated web steel box-concrete combined beam bridge optimizes steel consumption configuration, further reduces the self weight of the structure, adopts the precast concrete bridge deck, further improves the assembly degree, has short construction period and high standardization degree, has remarkable economic and social benefits, and has important significance for promoting the large-scale application of steel structure bridges.
Description
Technical Field
The utility model belongs to the technical field of bridge engineering, concretely relates to assembled corrugated web steel case-UHPC combination beam bridge.
Background
The corrugated web steel box-concrete combined beam bridge is a combined structure form which is applied more in recent years, particularly in large-span, ultra-wide and complex linear bridges, the corrugated web steel box-concrete combined beam bridge has obvious advantages, more reasonable structural stress and full exertion of material performance, can realize fine management and batch application by adopting factory manufacturing and assembly construction, has good social and economic benefits, and has wide application prospects in highways and municipal bridges.
Although the traditional steel-concrete composite structure bridge solves the problems of easy cracking, poor durability, long construction period and short service life of the concrete bridge, the traditional steel-concrete composite structure bridge has the advantages of large steel consumption, small stress reserve and low influence of concrete strength, when the span is large, a concrete bridge deck is a weak link of the composite beam, and particularly, the traditional steel-concrete composite structure bridge is easy to crack at a middle pivot of a continuous beam system, and the reliability of the bridge deck is influenced.
When the width of a bridge deck is large, a single-box multi-chamber steel box composite beam is generally adopted, a large number of reinforcing ribs need to be arranged to ensure the stability and the connection strength of steel plate pieces, so that the welding workload is huge, the quality control cost and the difficulty are increased, the fatigue strength is not easy to control, the stress of the multi-chamber structure is undefined, the conditions that the stress of a side web plate is too large and the stress of a middle web plate is relatively small exist, the situation that materials can not be supplied to the same box chamber as required is caused, and the optimal design is difficult to realize.
The web form of the traditional steel-concrete composite structure bridge is mostly a straight web, the straight web form is simple to manufacture, but when the beam height is large, the stability and the shearing buckling performance of the web are difficult to guarantee, a large amount of reinforcing ribs and supporting measures are needed, the axial rigidity of the traditional straight web type composite box beam enables the prestress loss of the box beam to be large, the prestress efficiency is not high, and the respective material advantages are difficult to fully exert.
Aiming at the defects and shortcomings of the traditional steel-concrete composite beam, in order to adapt to the engineering construction concept of fine design and assembly construction, it is necessary to develop an assembly type corrugated web steel box-concrete composite beam bridge which is clear in structural stress, can give full play to the advantages of various materials and is convenient to transport and install and a construction method.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an assembled corrugated web steel case-UHPC composite beam bridge, this assembled corrugated web steel case-UHPC composite beam bridge be convenient for design and construction, and the structure atress is more reasonable, and with the steel volume less, the transportation of steel case roof beam festival section, the deck plate is prefabricated to be assembled, and the degree of assemblability is high, and construction convenience is swift, and comprehensive properties obtains effectively promoting.
The utility model discloses a technical scheme as follows:
an assembled corrugated web steel box-UHPC combined beam bridge consists of a corrugated web steel box and an UHPC bridge deck, wherein the corrugated web steel box is an open box-shaped structure consisting of a flat steel bottom plate 1, a corrugated steel web 2 and a flat steel top plate 3, and adjacent corrugated web steel boxes are connected through an inter-box cross beam 12; the UHPC bridge deck comprises an in-box prefabricated UHPC bridge deck 6, an inter-box prefabricated UHPC bridge deck 7 and a cantilever cast-in-situ UHPC bridge deck 8, wherein adjacent prefabricated UHPC bridge decks are connected through a cast-in-situ wet joint UHPC bridge deck 9; and a plurality of UHPC bridge deck plates are correspondingly arranged on a plurality of corrugated web steel boxes to form the assembled corrugated web steel box-UHPC combined beam bridge.
The corrugated steel web 2 is vertically welded on two sides of the flat steel bottom plate 1, and the top end of the corrugated steel web 2 is horizontally arranged and welded with the flat steel top plate 3.
The beam end of the assembled corrugated web steel box-UHPC combined beam bridge is provided with an end beam 14, fine pebble micro-expansion concrete 15 is poured into the end beam 14, and transverse partition beams 5 are arranged in the corrugated web steel box at equal intervals.
The precast box inner bridge deck 6 is erected on the flat steel top plate 3; and the bridge deck plate 7 between the prefabricated boxes is erected between the two adjacent corrugated web steel box flat steel top plates 3.
And the cantilever cast-in-situ UHPC bridge deck plate 8 is poured on the outer side of the UHPC bridge deck plate.
And a cantilever plugging plate 10 is arranged on the outer side of the cantilever cast-in-situ UHPC bridge deck 8.
The assembled corrugated web steel box-UHPC combined beam bridge is provided with bottom plate stiffening ribs 4 and cantilever stiffening plates 11, the flat steel bottom plate 1 is symmetrically provided with the two bottom plate stiffening ribs 4, and the cantilever stiffening plates 11 are arranged on cantilever parts at the positions of the diaphragm beams 5 and the end cross beams 14.
When the assembled corrugated web steel box-UHPC combined beam bridge is a continuous beam system, pouring middle pivot box beam concrete 18 between the adjacent two side diaphragm beams 5 at the middle pivot; pouring middle fulcrum beam bottom concrete 17 on the flat steel bottom plate 1 in the range of the hogging moment sections on two sides of the middle fulcrum; and pouring middle supporting point web plate concrete 19 on the corrugated steel web plates 2 on two sides of the middle supporting point to form a lining concrete structure.
The utility model has the advantages that: 1) the utility model is suitable for a different span's aequilate and widen bridge can satisfy different design demands according to the steel case piece number of difference and the width between the different casees.
2) The utility model discloses a many casees list room structure is connected through crossbeam, end crossbeam between the case between the steel case, and limit case roof beam and well case roof beam can design respectively, and the atress is clear and definite, and the outer welding work volume of mill is few, and welding quality guarantees easily to the festival section transportation is convenient, erects and hoist easily.
3) The utility model discloses the steel case roof beam adopts the wave form steel web, compares with straight web, and the wave form steel web has obvious advantage in the structural stress, and the decking shrink creep influences for a short time, and anti shear buckling ability reinforce, and construction process is ripe, and prestressing force is efficient, and reducible steel dosage, the appearance is pleasing to the eye in highway municipal bridge, and the suitability is strong.
4) The utility model discloses a set up external prestressing force steel beam, utilize the case roof beam diaphragm to set up the anchor piece and turn to the piece, can effectively adjust the internal force and the rigidity of continuous beam, reduce the internal force of girder steel, reduce the amount of deflection of girder, the later stage is according to the bridge behaviour in service, conveniently increases, changes external prestressing force to the optimal effect is traded to minimum cost.
5) The utility model discloses a UHPC decking, wherein incasement UHPC decking and incasement UHPC decking are the mill's prefabrication, have saved construction period greatly, have improved the prefabricated efficiency of construction to utilize the good performance of UHPC material, combine arranging of external prestressing tendons and internal prestressing tendons, make combination beam decking no longer its weak link.
6) The utility model discloses a wave form web steel case-UHPC composite beam bridge construction method, through reasonable UHPC decking hoist and mount scheme, reduce the steel consumption of composite beam, effectively reduced the tensile stress of decking in the construction phase; the segmental steel beams are assembled in a factory, and the stress deformation of the steel beams is small in the initial stage; the calculation considers the difference of initial stress formed by the bridge deck in times and considers the redistribution of the stress and the internal force of the bridge deck caused by creep. The stress redistribution effect is obvious, creep can reduce the concrete compressive stress of the bridge deck slab in the box and increase the concrete compressive stress between the boxes, the anti-cracking problems that the concrete compressive stress in the box is large and is not easy to control and the compressive stress between the boxes is insufficient are effectively solved, and the creep is not a negative factor any more due to the corrugated steel web plate folding effect.
Drawings
Fig. 1 is a schematic cross-sectional view one of an assembled corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 2 is a schematic cross-sectional view of a fabricated corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 3 is a schematic elevation view of an assembled corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 4 is a schematic plan view of a fabricated corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 5 is a schematic three-dimensional cross-sectional view of a fabricated corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 6 is a schematic view of an in vitro prestressed tendon vertical plane of an assembled corrugated web steel box-UHPC composite girder bridge according to embodiment 1 of the present invention;
fig. 7 is a schematic elevation view of an assembled corrugated web steel box-UHPC composite beam bridge according to embodiment 2 of the present invention at a middle pivot point;
fig. 8 is a schematic plan view of a fabricated corrugated web steel box-UHPC composite girder bridge according to embodiment 2 of the present invention at a middle pivot point;
fig. 9 is a schematic three-dimensional cross-sectional view of a fabricated corrugated web steel box-UHPC composite girder bridge according to embodiment 2 of the present invention at a middle pivot point;
shown in the figure: 1. the concrete-reinforced concrete composite beam comprises a flat steel bottom plate, 2 corrugated steel web plates, 3 flat steel top plates, 4 bottom plate stiffening ribs, 5 transverse partition beams, 6 box prefabricated UHPC bridge deck plates, 7 box prefabricated UHPC bridge deck plates, 8 cantilever cast-in-place UHPC bridge deck plates, 9 wet joint cast-in-place UHPC bridge deck plates, 10 cantilever end plugging plates, 11 cantilever stiffening plates, 12 box cross beams, 13 shear nails, 14 end cross beams, 15 fine stone micro-expansion concrete poured into the end cross beams, 16 external prestress beams, 17 middle fulcrum beam bottom concrete, 18 middle fulcrum box beam concrete, 19 middle fulcrum web plate concrete and 20 internal prestress beams.
Detailed Description
The technical solution of the present invention is further described by the following specific embodiments with reference to the accompanying drawings:
example 1
The utility model provides an assembled corrugated web steel box-UHPC composite beam and construction method, this embodiment be one of them 40m stride 16.5m wide simple beam system and construction method, the simple beam height of girder is 2000mm, by two the corrugated web steel box is constituteed, and the case interval is 7500mm, wherein corrugated web steel box height 1750mm, the thick 200mm of bridge floor, as shown in fig. 1 ~ 6.
The corrugated web steel box in the embodiment comprises a flat steel bottom plate 1, two corrugated steel webs 2 vertically welded on two sides of the steel bottom plate and a flat steel top plate 3 horizontally arranged at the top ends of the corrugated steel webs and welded on the corrugated steel webs, wherein the flat steel bottom plate 1, the corrugated steel webs 2 and the flat steel top plate 3 form an open box structure, the flat steel bottom plate is 3000mm wide, and in order to adapt to the stress characteristics of large span bending moment and small beam end bending moment of a simply supported beam, a variable-thickness bottom plate is adopted, namely the thickness of the bottom plate in the range of 10m at two sides of a beam end is 22mm, the thickness of the bottom plate in the range of 20m in the span is 28mm, in addition, two bottom plate stiffening ribs 4 are arranged on the flat steel bottom plate 1 according to a symmetrical center, and are two steel plates which are 200mm wide and 20mm thick; the corrugated steel web plate is of a BCSW1200 type, and in order to adapt to structural stress, the thickness of the web plate is also variable, namely the thickness of the web plate is 16mm within a span of 21.6m, and the thickness of the web plate at the other beam end is 18 mm; the flat steel top plate is symmetrically arranged on two sides, the width of the flat steel top plate is 700mm, and the thickness of the flat steel top plate is 20 mm.
Wherein, the inner transverse beam 5 is arranged in the corrugated web steel box at equal intervals and symmetrically arranged at the center of the bridge span according to the interval of 3600mm or 4800 mm.
The UHPC comprises an in-box prefabricated bridge deck 6, an inter-box prefabricated bridge deck 7, a cantilever cast-in-place bridge deck 8 and a wet joint cast-in-place bridge deck 9. Based on the good mechanical property and durability of UHPC and being suitable for assembly construction, the prefabricated part and the cast-in-place part of the bridge deck slab of the embodiment both adopt UHPC materials.
The prefabricated bridge deck 6 in the box is erected on the corrugated web steel box flat steel top plate 3, the width of the prefabricated bridge deck 6 is 2250mm, the prefabricated bridge deck 7 between the boxes is erected between the two adjacent corrugated web steel box flat steel top plates 3, the width of the prefabricated bridge deck is 7250mm, the cantilever cast-in-place bridge deck 8 is a cast-in-place part on the outer side of the boundary beam, the width of the cantilever cast-in-place bridge deck is 1375mm, and the wet joint cast-in-place bridge deck 9 is poured between the two adjacent prefabricated bridge decks and is used for connecting all the bridge decks to form a whole stress body.
The cantilever cast-in-place bridge deck 8 is provided with a cantilever plug plate 10 on the outer side, and cantilever stiffening plates 11 are arranged on cantilever parts at the positions of the diaphragm beams 5 and the end cross beams 14.
The end beam 14 is arranged at the beam end of the simply supported beam and comprises an in-box part and an in-box part, the in-box part is welded with a main beam web, fine gravel micro-expansion concrete 15 is poured into the end beam, the width of the end beam 14 is 800mm, and shear nails 13 are densely distributed on the top plate of the end beam at equal intervals and are connected with a cast-in-place bridge deck 9.
In this embodiment, the inter-box beam 12 is a beam structure connecting two adjacent corrugated web steel boxes, is arranged between the steel boxes corresponding to the diaphragm beams 5, and is arranged at a distance of 3600mm or 4800mm along the longitudinal bridge direction, and the inter-box beam 12 and the main beam can be connected by welding or high-strength bolts.
The beam height of the cross beams 12 between the boxes is 1200mm, the cross beam web plates are made of BCSW 1200-type corrugated steel web plates identical to the main beams, the top of each cross beam is aligned to the top plate 3 of each main beam, the cross beam top plates are used for connecting the main beams on two adjacent sides to provide transverse connection, the cross beam top plates are also used for erecting prefabricated box bridge decks 7, and cast-in-place bridge deck plate wet joints 9 are poured on the top of the cross beams between the boxes to enable the bridge decks to be connected into a whole.
The shear nails 13 are stud connectors which are symmetrically and uniformly distributed on the flat steel top plate, the diaphragm beam top plate, the inter-box beam top plate and the end beam top plate at certain intervals and are used for connecting the bridge deck plate and the corrugated web steel box, the material of the shear nails 13 adopts ML15AL, and the material, the mechanical property and the welding requirement of the shear nails need to meet the requirements of cylindrical head welding nails for arc stud welding (GB 10433).
In addition, the shear nails 13 are also arranged in the end cross beam 14 and connected with fine stone micro-expansion concrete 15 poured in the end cross beam to form a stressed whole.
In the embodiment, the wave-shaped web steel box is also internally provided with an external prestressed beam 16, the wave-shaped web steel box is provided with an anchoring block and a steering block by utilizing the diaphragm plate 5 in the wave-shaped web steel box, the high efficiency of the prestress used by the wave-shaped web steel box is benefited, the internal force and the rigidity of the simply supported beam can be effectively adjusted, the internal force of the main beam is reduced, the deflection of the main beam is reduced, the external prestress is conveniently increased and replaced according to the service condition of the bridge in the later period, and the optimal effect is achieved with the minimum cost.
The embodiment is a simple supported beam system of an assembled corrugated web steel box-UHPC composite beam, and the construction method comprises the following steps:
1 factory processing steel beam, prefabricating UHPC bridge deck, erecting whole hole steel beam, connecting end beam and inter-box beam
Prefabricating an UHPC bridge deck in a box and an UHPC bridge deck between boxes in a factory; constructing a foundation, a pier and a capping beam; setting a temporary support and installing a permanent support; before the temporary support is not detached, the permanent support is in an unstressed state; the steel beams are manufactured in a factory, and are transported to a bridge site or a steel beam storage place in a construction site after being pre-assembled and inspected to be qualified; pouring concrete (with the thickness of 25cm) at the supporting position of the end beam; erecting a whole-hole single-box steel box, and placing the whole-hole single-box steel box on a temporary support to form a simply supported state; the concrete strength and elastic modulus at the supporting position of the cross beam at the front end need to reach more than 90% of corresponding values; and end beams and cross beams between boxes are hoisted and connected between the steel boxes.
2 hoisting and erecting a prefabricated UHPC bridge deck in the box and tensioning external prestressed steel bundles
Pouring the residual end beam fine stone micro-expansion concrete; hoisting and erecting a prefabricated UHPC bridge deck in the box, wherein the prefabricated UHPC bridge deck can be hoisted to the bridge deck after being stored for 6 months; tensioning the external prestressed steel bundles;
3 hoisting and erecting a prefabricated UHPC bridge deck between boxes, pouring a cantilever UHPC bridge deck and wet joints
Hoisting and erecting a box room prefabricated UHPC bridge deck, wherein the prefabricated concrete bridge deck must be stored for more than 6 months before hoisting; pouring partial and all wet joint concrete of the cantilever cast-in-place UHPC bridge deck; the simply supported beam span and the adjacent span in the first connection are continuous by adopting a bridge deck, and ultrahigh-strength concrete is poured in the notch.
4 installation of subsidiary works
When the strength of the cast-in-place concrete and the elastic modulus reach more than 70% of the corresponding value of 28d, the temporary support is dismantled; installing an anti-collision guardrail; and finishing waterproof layer, bridge pavement and other auxiliary projects.
Example 2
The utility model provides an assembled corrugated web steel box-UHPC combination beam bridge and construction method, this embodiment be wherein embodiment 1's continuous beam system and construction method, continuous beam is porous 40m strides, and the bridge width is 16.5m wide, and the roof beam height is 2000mm, and end strides and midspan are by two corrugated web steel box is constituteed, and the case interval is 7500mm, and wherein corrugated web steel box height 1750mm, the bridge floor is thick 200mm, as shown in figure 7 ~ 9.
The continuous system bridge comprises an end span, a midspan corrugated web steel box and a UHPC bridge deck, wherein the corrugated web steel box is of an open box structure formed by a flat steel bottom plate 1, two corrugated steel webs 2 vertically welded on two sides of the steel bottom plate 1 and a flat steel top plate 3 horizontally arranged and welded on the top ends of the corrugated steel webs, the flat steel bottom plate is 3000mm wide, in order to adapt to the stress characteristics of a continuous beam, a variable-thickness bottom plate is adopted, namely the thickness of the bottom plate in the range of 10m on two sides of the beam end is 22mm, the thickness of the bottom plate in the range of 20m in the midspan is 25mm, and in addition, two bottom plate stiffening ribs 4 are arranged on the flat steel bottom plate 1 according to the symmetrical center, wherein the two bottom plate stiffening ribs are two steel plates which are 200mm wide and 20; the corrugated steel web plate is of a BCSW1200 type, and in order to adapt to structural stress, the thickness of the web plate is also variable, namely the thickness of the web plate is 16mm within a span of 21.6m, and the thickness of the web plate at the other beam end is 18 mm; the flat steel top plate is symmetrically arranged on two sides, the width of the flat steel top plate is 700mm, and the thickness of the flat steel top plate is 20 mm.
Wherein, the inner transverse beam 5 is arranged in the corrugated web steel box at equal intervals and symmetrically arranged at the center of the bridge span according to the interval of 3600mm or 4800 mm.
Wherein, UHPC includes prefabricated decking 6 in the case, prefabricated decking 7 between the case, cast-in-place decking 8 of cantilever and the cast-in-place decking 9 of wet seam. Based on the good mechanical property and durability of UHPC and being suitable for assembly construction, the prefabricated part and the cast-in-place part of the bridge deck slab of the embodiment both adopt UHPC materials.
The end beam 14 is arranged at the end part of the continuous beam joint end and comprises an in-box part and an in-box part, the in-box part is welded with a main beam web, fine gravel micro-expansion concrete 15 is poured into the end beam, the width of the end beam 14 is 800mm, and shear nails 13 are densely distributed on the top plate of the end beam at equal intervals and connected with a cast-in-situ UHPC wet joint 9.
The middle fulcrum box girder concrete 18 is poured between the adjacent two side box inner transverse clapboards at the middle fulcrum, the middle fulcrum beam bottom concrete 17 is poured on the flat steel bottom plate 1 within the range of 10m at two sides of the center line of the bridge pier, the thickness of the middle fulcrum beam bottom concrete is 180mm, and in addition, the middle fulcrum web concrete 19 is filled on the inner side of the corrugated steel web within a wavelength range at two sides of the center line of the bridge pier, so that a lining concrete structure is formed.
The cross beam 12 between the boxes is a cross beam structure connecting two adjacent corrugated web steel boxes, is arranged between the steel boxes corresponding to the transverse partition beams 5, is arranged at a distance of 3600mm or 4800mm along the longitudinal bridge direction, and can be connected with the main beam by welding or adopting high-strength bolts.
The shear nails 13 are stud connectors which are symmetrically and uniformly distributed on the flat steel top plate, the transverse partition beam top plate, the inter-box beam top plate and the end beam top plate at certain intervals and are used for connecting the bridge deck plate and the corrugated web steel box, the material of the shear nails 13 adopts ML15AL, and the material, the mechanical property and the welding requirement of the shear nails need to meet the requirements of cylindrical head welding nails for arc stud welding (GB 10433).
The shear nails 13 are further arranged in the end cross beam 14, the middle fulcrum beam bottom concrete 17, the middle fulcrum box girder concrete 18 and the middle fulcrum web plate concrete 19 and connected with the concrete poured therein to form a stressed whole.
The corrugated web steel box is internally provided with an external prestressed beam 16, the diaphragm plate 5 in the corrugated web steel box is utilized to be provided with an anchoring block and a steering block, the high efficiency of the prestress used by the corrugated web steel box is benefited, the internal force and the rigidity of the continuous beam can be effectively adjusted, the internal force of the main beam is reduced, the deflection of the main beam is reduced, the external prestress can be conveniently increased and replaced according to the service condition of the bridge in the later period, and the optimal effect is achieved with the minimum cost.
The prestressed beams 20 in the body are prestressed beams in a hogging moment area, are arranged in the range of the bridge deck plates on two sides of the middle fulcrum and are linearly arranged, and the aim of the prestressed beams is to solve the problem of bridge deck plate cracking caused by hogging moment at the middle fulcrum of the continuous beam.
The embodiment is a continuous beam system of an assembled corrugated web steel box-UHPC composite beam, and the construction method comprises the following steps:
1 factory processing steel beam, prefabricating UHPC bridge deck, erecting whole hole steel beam, connecting end beam and inter-box beam
Prefabricating an UHPC bridge deck in a box and an UHPC bridge deck between boxes in a factory; constructing a foundation, a pier and a capping beam; arranging a coupling end and a middle fulcrum temporary support and installing a permanent support; before the temporary support of the coupling end is not detached, the permanent support of the coupling end is in an unstressed state; the steel beams are manufactured in a factory, and are transported to a bridge site or a steel beam storage place in a construction site after being pre-assembled and inspected to be qualified; pouring concrete (with the thickness of 25cm) at the supporting position of the end beam; erecting a whole-hole single-box steel box, and placing the whole-hole single-box steel box on a temporary support to form a simply supported state; the concrete strength and elastic modulus at the supporting position of the cross beam at the front end need to reach more than 90% of corresponding values; and end beams and cross beams between boxes are hoisted and connected between the steel boxes.
2 hoisting and erecting a prefabricated UHPC bridge deck in the box, tensioning external prestressed steel bundles, and casting in-situ middle fulcrum concrete
Pouring the residual end beam fine stone micro-expansion concrete; hoisting and erecting a prefabricated UHPC bridge deck in the box, wherein the prefabricated UHPC bridge deck can be hoisted to the bridge deck after being stored for 6 months; tensioning the external prestressed steel beam, and pouring middle fulcrum box girder concrete, middle fulcrum beam bottom concrete and middle fulcrum web concrete;
3, tensioning the negative bending moment prestress steel beam, hoisting and erecting a prefabricated UHPC bridge deck between boxes, and pouring a cantilever UHPC bridge deck and a wet joint;
tensioning the prestressed steel bundles in the hogging moment area, hoisting and erecting a prefabricated UHPC bridge deck between boxes, and storing the prefabricated concrete bridge deck for more than 6 months before hoisting; pouring partial and all wet joint concrete of the cantilever cast-in-place UHPC bridge deck;
4 installation of subsidiary works
When the strength of the cast-in-place concrete and the elastic modulus reach more than 70% of the corresponding value of 28d, the in-connection temporary support is dismantled, and the system conversion is finished; installing an anti-collision guardrail; and finishing waterproof layer, bridge pavement and other auxiliary projects.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides an assembled wave form web steel case-UHPC composite beam bridge, comprises wave form web steel case and UHPC decking, wave form web steel case is the open box structure of constituteing by flat steel bottom plate, wave form steel web and flat steel roof, and adjacent wave form web steel case passes through the beam connection between the case, its characterized in that: the UHPC bridge deck comprises an in-box prefabricated UHPC bridge deck, an inter-box prefabricated UHPC bridge deck and a cantilever cast-in-situ UHPC bridge deck, wherein adjacent prefabricated UHPC bridge decks are connected through a cast-in-situ wet joint UHPC bridge deck; and a plurality of UHPC bridge deck plates are correspondingly arranged on a plurality of corrugated web steel boxes to form the assembled corrugated web steel box-UHPC combined beam bridge.
2. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: the corrugated steel web plates are vertically welded on two sides of the flat steel bottom plate, and the top ends of the corrugated steel web plates are horizontally arranged and welded with flat steel top plates.
3. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: the beam end of the assembled corrugated web steel box-UHPC combined beam bridge is provided with an end beam, fine gravel micro-expansion concrete is poured into the end beam, and diaphragm beams are arranged in the corrugated web steel box at equal intervals.
4. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: a prefabricated box inner bridge deck is erected on the flat steel top plate; and bridge decks between the prefabricated boxes are erected between the two adjacent corrugated web steel box flat steel top plates.
5. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: the cantilever cast-in-place UHPC bridge deck slab is cast on the outer side of the UHPC bridge deck slab.
6. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: and a cantilever plug board is arranged on the outer side of the cantilever cast-in-situ bridge deck.
7. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: the assembled corrugated web steel box-UHPC combined beam bridge is provided with bottom plate stiffening ribs and cantilever stiffening plates, the two bottom plate stiffening ribs are symmetrically arranged on the flat steel bottom plate, and the cantilever stiffening plates are arranged on cantilever parts at the positions of the diaphragm beams and the end cross beams.
8. The fabricated corrugated web steel box-UHPC composite girder bridge according to claim 1, wherein: when the assembled corrugated web steel box-UHPC combined beam bridge is a continuous beam system, pouring middle pivot box beam concrete between the adjacent two side diaphragm beams at the middle pivot; pouring middle fulcrum beam bottom concrete on a flat steel bottom plate in the range of the hogging moment sections on two sides of the middle fulcrum; and pouring middle fulcrum web plate concrete on the corrugated steel web plates on two sides of the middle fulcrum to form a lining concrete structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020238506.7U CN211947879U (en) | 2020-03-02 | 2020-03-02 | Assembled corrugated web steel box-UHPC (ultra high performance concrete) combined beam bridge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202020238506.7U CN211947879U (en) | 2020-03-02 | 2020-03-02 | Assembled corrugated web steel box-UHPC (ultra high performance concrete) combined beam bridge |
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